c - Segmentation Fault on fclose -

i getting segmentation fault error while running program in linux. working fine in aix.

and seg fault message in gdb...

program received signal sigsegv, segmentation fault fclose@@glibc_2.2.5 () /lib64/libc.so.6

            <pre><code>             #include<stdio.h>             #include<string.h>             #include<unistd.h>             #include<time.h>             #include<sys/types.h>             #define _monthly "99992016"               file *source,*list,*wlist,*movlist,*biflis;             char sf[85],sf1[85];             char filename[85],filename1[85],name[140],fstring[140],iname[140],account[85];             char *ptr="",*st="";             int i,len,x,y,z,bif_count,pin_count,your_monthly_count,count1,count2;             char suffix[4]=".pin";             char *nptr=" ";             file *biflis;              int p;             int main()             {             long t;             system("ls -l|sort -n >test.txt");             system("cat test.txt|grep bh|awk '$5 <= 1610612736 {print $9}' > bhatia.out");             system("cat test.txt|grep bh|awk '$5 > 1610612736 {print $9}' > bhatia1.out");                  if((list=fopen("bhatia.out","r"))==null)             {  printf("\n error opening bhatia.out\n\n "); return 0; }               if((biflis=fopen("biffile_account.lis","w"))==null)              {   printf("\n error opening biffile_account.lis file\n\n");               return 0; }             bif_count=0;             pin_count=0;             your_monthly_count=0;             count1=0;             while((fgets(filename,85,list))!=null)             {                 ptr=filename;              for(i=0;*ptr;i++,ptr++)              {               sf[i]=*ptr;              }i--;              sf[i]='\0';               if((source=fopen(sf,"r"))==null)              {               printf("\nerror opening source file %s\n",sf);               return 0;              }             fseek(source,0,seek_end);             fseek(source,-90,seek_cur);              while((fgets(name,140,source))!=null)              {               st=strstr(name,_monthly);              count2=0;               if(st!=null)               {             your_monthly_count++;             strcpy(account," ");             count2++;             //sprintf(fstring,"%s~%s",filename1,account);             }              count1= count2 + count1;             }             fclose(source);             if( count1 > 0 )             {               printf(" %s   gbif file  has correct footer    having ",sf,source);                 printf(" %d number of correct bills \n",count1);             }                 else             {             printf(" %s   gbif file has footer missing , have  incorrect bills  \n",sf,source);             //printf(" %d number of in incorrect bills \n",count1);             }                  count1=0;             bif_count++;             }              </code></pre> 

here's 1 major bug:

printf(" %s   gbif file  has correct footer    having ",sf,source); 

you need go through variables declared here:

file *source,*list,*wlist,*movlist,*biflis; 

every single 1 of them needs have 1 call fopen , 1 call fclose, or should removed. declare file *biflis; twice.

and there no need use global variables @ all.